12. It’s difficult to twist/loosen the battery packs.July 24, 2020December 18, 2021 Please lubricate O-rings with silicone grease or replace with new O-rings.Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment *Name * Email * Website Save my name, email, and website in this browser for the next time I comment. previous11. The LED is obviously damaged and the light turns bluish.next13. The indicator light changes from blue to green, and then red in a short time.